package saucaca.CustomView;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffColorFilter;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ImageView;

import com.lemon.kenhnhacvn.R;

public class CircularImageView extends ImageView {
	// Border & Selector configuration variables
	private boolean hasBorder;
	private boolean hasSelector;
	private boolean isSelected;
	private int borderWidth;
	private int canvasSize;
	private int selectorStrokeWidth;

	// Objects used for the actual drawing
	private BitmapShader shader;
	private Bitmap image;
	private Paint paint;
	private Paint paintBorder;
	private Paint paintSelectorBorder;
	private ColorFilter selectorFilter;

	public CircularImageView(Context context) {
		this(context, null);
	}

	public CircularImageView(Context context, AttributeSet attrs) {
		this(context, attrs, R.attr.circularImageViewStyle);
	}

	public CircularImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init(context, attrs, defStyle);
	}

	/**
	 * Initializes paint objects and sets desired attributes.
	 * 
	 * @param context
	 * @param attrs
	 * @param defStyle
	 */
	private void init(Context context, AttributeSet attrs, int defStyle) {
		// Initialize paint objects
		paint = new Paint();
		paint.setAntiAlias(true);
		paintBorder = new Paint();
		paintBorder.setAntiAlias(true);
		paintSelectorBorder = new Paint();
		paintSelectorBorder.setAntiAlias(true);

		// load the styled attributes and set their properties
		TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.CircularImageView, defStyle, 0);

		// Check if border and/or border is enabled
		hasBorder = attributes.getBoolean(R.styleable.CircularImageView_border, false);
		hasSelector = attributes.getBoolean(R.styleable.CircularImageView_selector, false);

		// Set border properties if enabled
		if (hasBorder) {
			int defaultBorderSize = (int) (2 * context.getResources().getDisplayMetrics().density + 0.5f);
			setBorderWidth(attributes.getDimensionPixelOffset(R.styleable.CircularImageView_border_width, defaultBorderSize));
			setBorderColor(attributes.getColor(R.styleable.CircularImageView_border_color, Color.WHITE));
		}

		// Set selector properties if enabled
		if (hasSelector) {
			int defaultSelectorSize = (int) (2 * context.getResources().getDisplayMetrics().density + 0.5f);
			setSelectorColor(attributes.getColor(R.styleable.CircularImageView_selector_color, Color.TRANSPARENT));
			setSelectorStrokeWidth(attributes.getDimensionPixelOffset(R.styleable.CircularImageView_selector_stroke_width, defaultSelectorSize));
			setSelectorStrokeColor(attributes.getColor(R.styleable.CircularImageView_selector_stroke_color, Color.BLUE));
		}

		// Add shadow if enabled
		if (attributes.getBoolean(R.styleable.CircularImageView_shadow, false))
			addShadow();

		// We no longer need our attributes TypedArray, give it back to cache
		attributes.recycle();
	}

	/**
	 * Sets the CircularImageView's border width in pixels.
	 * 
	 * @param borderWidth
	 */
	public void setBorderWidth(int borderWidth) {
		this.borderWidth = borderWidth;
		this.requestLayout();
		this.invalidate();
	}

	/**
	 * Sets the CircularImageView's basic border color.
	 * 
	 * @param borderColor
	 */
	public void setBorderColor(int borderColor) {
		if (paintBorder != null)
			paintBorder.setColor(borderColor);
		this.invalidate();
	}

	/**
	 * Sets the color of the selector to be draw over the CircularImageView. Be
	 * sure to provide some opacity.
	 * 
	 * @param selectorColor
	 */
	public void setSelectorColor(int selectorColor) {
		this.selectorFilter = new PorterDuffColorFilter(selectorColor, PorterDuff.Mode.SRC_ATOP);
		this.invalidate();
	}

	/**
	 * Sets the stroke width to be drawn around the CircularImageView during
	 * click events when the selector is enabled.
	 * 
	 * @param selectorStrokeWidth
	 */
	public void setSelectorStrokeWidth(int selectorStrokeWidth) {
		this.selectorStrokeWidth = selectorStrokeWidth;
		this.requestLayout();
		this.invalidate();
	}

	/**
	 * Sets the stroke color to be drawn around the CircularImageView during
	 * click events when the selector is enabled.
	 * 
	 * @param borderColor
	 */
	public void setSelectorStrokeColor(int selectorStrokeColor) {
		if (paintSelectorBorder != null)
			paintSelectorBorder.setColor(selectorStrokeColor);
		this.invalidate();
	}

	/**
	 * Adds a dark shadow to this CircularImageView.
	 */
	@SuppressLint("NewApi")
	public void addShadow() {
		setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
		paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);
	}

	@Override
	public void onDraw(Canvas canvas) {
		// Don't draw anything without an image
		if (image == null)
			return;

		// Nothing to draw (Empty bounds)
		if (image.getHeight() == 0 || image.getWidth() == 0)
			return;

		// Compare canvas sizes
		int oldCanvasSize = canvasSize;

		canvasSize = canvas.getWidth();
		if (canvas.getHeight() < canvasSize)
			canvasSize = canvas.getHeight();

		// Reinitialize shader, if necessary
		if (oldCanvasSize != canvasSize)
			refreshBitmapShader();

		// Apply shader to paint
		paint.setShader(shader);

		// Keep track of selectorStroke/border width
		int outerWidth = 0;

		// Get the exact X/Y axis of the view
		int center = canvasSize / 2;

		if (hasSelector && isSelected) { // Draw the selector stroke & apply the
											// selector filter, if applicable
			outerWidth = selectorStrokeWidth;
			center = (canvasSize - (outerWidth * 2)) / 2;

			paint.setColorFilter(selectorFilter);
			canvas.drawCircle(center + outerWidth, center + outerWidth, ((canvasSize - (outerWidth * 2)) / 2) + outerWidth - 4.0f, paintSelectorBorder);
		} else if (hasBorder) { // If no selector was drawn, draw a border and
								// clear the filter instead... if enabled
			outerWidth = borderWidth;
			center = (canvasSize - (outerWidth * 2)) / 2;

			paint.setColorFilter(null);
			canvas.drawCircle(center + outerWidth, center + outerWidth, ((canvasSize - (outerWidth * 2)) / 2) + outerWidth - 4.0f, paintBorder);
		} else
			// Clear the color filter if no selector nor border were drawn
			paint.setColorFilter(null);

		// Draw the circular image itself
		canvas.drawCircle(center + outerWidth, center + outerWidth, ((canvasSize - (outerWidth * 2)) / 2) - 4.0f, paint);
	}

	@Override
	public boolean dispatchTouchEvent(MotionEvent event) {
		// Check for clickable state and do nothing if disabled
		if (!this.isClickable()) {
			this.isSelected = false;
			return super.onTouchEvent(event);
		}

		// Set selected state based on Motion Event
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			this.isSelected = true;
			break;
		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_SCROLL:
		case MotionEvent.ACTION_OUTSIDE:
		case MotionEvent.ACTION_CANCEL:
			this.isSelected = false;
			break;
		}

		// Redraw image and return super type
		this.invalidate();
		return super.dispatchTouchEvent(event);
	}

	public void invalidate(Rect dirty) {
		super.invalidate(dirty);
		image = drawableToBitmap(getDrawable());
		if (shader != null || canvasSize > 0)
			refreshBitmapShader();
	}

	public void invalidate(int l, int t, int r, int b) {
		super.invalidate(l, t, r, b);
		image = drawableToBitmap(getDrawable());
		if (shader != null || canvasSize > 0)
			refreshBitmapShader();
	}

	@Override
	public void invalidate() {
		super.invalidate();
		image = drawableToBitmap(getDrawable());
		if (shader != null || canvasSize > 0)
			refreshBitmapShader();
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		int width = measureWidth(widthMeasureSpec);
		int height = measureHeight(heightMeasureSpec);
		setMeasuredDimension(width, height);
	}

	private int measureWidth(int measureSpec) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize = MeasureSpec.getSize(measureSpec);

		if (specMode == MeasureSpec.EXACTLY) {
			// The parent has determined an exact size for the child.
			result = specSize;
		} else if (specMode == MeasureSpec.AT_MOST) {
			// The child can be as large as it wants up to the specified size.
			result = specSize;
		} else {
			// The parent has not imposed any constraint on the child.
			result = canvasSize;
		}

		return result;
	}

	private int measureHeight(int measureSpecHeight) {
		int result = 0;
		int specMode = MeasureSpec.getMode(measureSpecHeight);
		int specSize = MeasureSpec.getSize(measureSpecHeight);

		if (specMode == MeasureSpec.EXACTLY) {
			// We were told how big to be
			result = specSize;
		} else if (specMode == MeasureSpec.AT_MOST) {
			// The child can be as large as it wants up to the specified size.
			result = specSize;
		} else {
			// Measure the text (beware: ascent is a negative number)
			result = canvasSize;
		}

		return (result + 2);
	}

	/**
	 * Convert a drawable object into a Bitmap
	 * 
	 * @param drawable
	 * @return
	 */
	public Bitmap drawableToBitmap(Drawable drawable) {
		if (drawable == null) { // Don't do anything without a proper drawable
			return null;
		} else if (drawable instanceof BitmapDrawable) { // Use the getBitmap()
															// method instead if
															// BitmapDrawable
			return ((BitmapDrawable) drawable).getBitmap();
		}

		// Create Bitmap object out of the drawable
		Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);
		drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
		drawable.draw(canvas);

		return bitmap;
	}

	/**
	 * Reinitializes the shader texture used to fill in the Circle upon drawing.
	 */
	public void refreshBitmapShader() {
		try {
			shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvasSize, canvasSize, false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
		} catch (Exception e) {
			// TODO: handle exception
		}
	}

	/**
	 * Returns whether or not this view is currently in its selected state.
	 */
	public boolean isSelected() {
		return this.isSelected;
	}
}